RPMs with the noarch.rpm extension refer to packages which do not depend on a certain computer's architecture (e.g. interpreted programming languages and shell scripts). The utility 7zip can unpack an RPM on Windows, and the enclosed cpio file archive.

After that dll was added, another dll was not found. I gave up after
several iterations. This was with
mingw32-hunspell-1.3.2-1.98.noarch.rpm and later
mingw32-hunspell-1.3.2-1.99.noarch.rpm (and associated lang and tools
RPMs).